LM3404HVMRX

Product Overview

Category: Integrated Circuit (IC)

Use: The LM3404HVMRX is a high-voltage buck regulator designed for driving high-power LEDs. It provides efficient and precise control of LED current, making it suitable for various lighting applications.

Characteristics: - High voltage input range - Wide output current range - Adjustable switching frequency - Dimming capability - Thermal shutdown protection - Small form factor

Package: The LM3404HVMRX is available in a compact 8-pin SOIC package, which offers ease of integration into LED driver circuits.

Essence: This IC serves as a crucial component in LED lighting systems, enabling efficient power conversion and accurate current regulation.

Packaging/Quantity: The LM3404HVMRX is typically sold in reels containing 2500 units per reel.

Specifications

• Input Voltage Range: 6V to 75V
• Output Current Range: Up to 1.5A
• Switching Frequency: Adjustable up to 2MHz
• Dimming Control: Analog/PWM
• Operating Temperature Range: -40°C to 125°C
• Efficiency: Up to 95%

Pin Configuration

The LM3404HVMRX features the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground reference pin
3. FB: Feedback pin for regulating LED current
4. DIM: Dimming control pin
5. EN: Enable pin for turning the device on/off
6. SW: Switch node connection for the internal MOSFET
7. VCC: Supply voltage pin for internal circuitry
8. VOUT: Output voltage pin

Functional Features

• High-efficiency step-down LED driver
• Accurate current regulation through feedback loop
• Wide input voltage range allows for versatile applications
• Dimming control enables brightness adjustment
• Thermal shutdown protection prevents overheating
• Small form factor facilitates compact designs

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings - Wide input voltage range accommodates various power sources - Dimming capability allows for flexible lighting control - Compact package size simplifies integration into designs - Thermal shutdown protection enhances reliability

Disadvantages: - Limited output current compared to some high-power LED drivers - Requires external components for complete circuit implementation

Working Principles

The LM3404HVMRX operates as a buck regulator, converting the higher input voltage to a lower regulated output voltage suitable for driving LEDs. It utilizes a pulse-width modulation (PWM) technique to regulate the LED current. The feedback pin (FB) monitors the LED current and adjusts the duty cycle of the internal MOSFET switch accordingly. This ensures precise current regulation and efficient power conversion.

Detailed Application Field Plans

The LM3404HVMRX finds application in various lighting systems, including: 1. Street lighting 2. Architectural lighting 3. Automotive lighting 4. Industrial lighting 5. Signage lighting 6. Outdoor area lighting

Its wide input voltage range, dimming capability, and high efficiency make it suitable for both AC and DC-powered lighting applications.

Detailed and Complete Alternative Models

1. LM3404HV: Similar to LM3404HVMRX but without the enable (EN) pin.
2. LM3404: Lower voltage version with an input voltage range of 6V to 42V.
3. LM3414: Higher output current version capable of driving up to 3A.

These alternative models offer flexibility in terms of input voltage range, output current capacity, and additional features.

In conclusion, the LM3404HVMRX is a highly efficient and versatile high-voltage buck regulator designed for driving high-power LEDs. Its compact size, wide input voltage range, and dimming capability make it suitable for various lighting applications. While it has some limitations in terms of output current and external component requirements, its advantages outweigh the disadvantages, making it a popular choice among LED lighting designers.

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